Charles J Swigert

US Patent:

46339825, Jan 6, 1987

Filed:

Feb 11, 1985

Appl. No.:

6/700597

Inventors:

Charles J. Swigert - Pacific Palisades CA

International Classification:

F16F 1503

US Classification:

188267

Abstract:

A positive electronic feedback circuit for mechanical vibration damping. The feedback circuit is connected from an output transducer fixed to a vibratable structure to an input transducer fixed to the structure. Preferably the feedback circuit has an output signal with a phase about 90 degrees lagging its input signal. Three conditions set forth herein make this possible.

US Patent:

44492359, May 15, 1984

Filed:

Jul 14, 1982

Appl. No.:

6/398131

Inventors:

Charles J. Swigert - Pacific Palisades CA

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

H04R 128

US Classification:

381 71

Abstract:

An acoustic disturbance in a thin support rod may be suppressed by detecting the disturbance, and processing the detected signal with electronic circuits to generate two output signals, which are injected into the rod at spatially separate positions. It is the solution of the waveforms for the output signals that is the essence of the technique. The principal component of the electronic circuits is an integrator. There are also delay devices and summing circuits.